iOS (Jailbroken): While you can easily lock out all your content on your iPhone with a passcode, that doesn't really help when you need to hand over your phone to a friend to use it quickly. FaBActivator is a jailbreak app that gives you precise controls over what's available on your iPhone when you activate it.

Jailbreaking is a process that changes little by little with each iOS upgrade. Rather than always…
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FaBActivator uses an Activator action to trigger, and when it's on, you can protect whatever data you like. You can disable notifications, specific apps, Notification Center, multitasking, and more. You can even set it so people can't power down your phone, or screw around with your volume settings. If you find yourself handing over your iPhone to people a lot, and you want precise control over what you block from other people, FaBActivator can handle just about everything you can imagine. You can find FaBActivator in the Big Boss Repository on Cydia.